Salix lutea

Nuttall

N. Amer. Sylv. 1: 63, plate 19. 1842.

Common names: Yellow willow
IllustratedEndemic
Synonyms: Salix cordata var. watsonii Bebb Salix eriocephala var. watsonii (Bebb) Dorn Salix lutea var. watsonii (Bebb) Jepson Salix rigida var. watsonii (Bebb) Cronquist
Treatment appears in FNA Volume 7. Treatment on page 123. Mentioned on page 102, 103, 104, 112, 113.

Shrubs, 3–7 m, (sometimes forming clones by stem fragmentation). Stems: branches (sometimes ± brittle at base) yellow-gray, yellowbrown, or gray-brown, (sometimes weakly glaucous, with sparkling wax crystals), glabrous; branchlets redbrown or brownish, glabrous or pilose, (inner membranaceous bud-scale layer free, separating from outer layer). Leaves: stipules rudimentary or foliaceous on early ones, foliaceous on late ones, apex acute or rounded; petiole convex to flat, or shallowly grooved adaxially, 4–19 mm, pilose, velvety, or pubescent to glabrescent adaxially; largest medial blade (sometimes amphistomatous), lorate, narrowly elliptic, elliptic, lanceolate, or narrowly oblanceolate, 42–90 × 8–32 mm, 2.8–3.9–5.6 times as long as wide, base rounded, convex, or subcordate, margins flat, entire, serrulate, crenulate, or sinuate, apex acuminate to acute, abaxial surface glaucous, glabrous, pilose, or sparsely long-silky, hairs straight, adaxial dull or slightly glossy, glabrous, pilose, sparsely long-silky, especially midrib; proximal blade margins entire, serrulate, or crenulate; juvenile blade reddish or yellowish green, glabrous or sparsely to moderately densely long-silky throughout, hairs white. Catkins flowering as leaves emerge; staminate stout, slender, or subglobose, 10–45 × 6–12 mm, flowering branchlet 0.5–2 mm; pistillate loosely to densely flowered, stout or subglobose, 13.5–38 × 7–15 mm, flowering branchlet 0.5–7 mm; floral bract brown, tawny, or bicolor, 0.6–1.2 mm, apex acute or rounded, abaxially glabrous or sparsely hairy, hairs curly. Staminate flowers: adaxial nectary narrowly oblong, oblong, square, or flask-shaped, 0.4–0.9 mm; filaments distinct or connate less than 1/2 their lengths, glabrous; anthers yellow or purple turning yellow, (ellipsoid or globose), 0.4–0.8 mm. Pistillate flowers: adaxial nectary oblong, square, or ovate, 0.3–0.9 mm, shorter than stipe; stipe 0.9–3.8 mm; ovary pyriform or ovoid, glabrous, beak gradually tapering to styles; ovules 12–24 per ovary; styles 0.1–0.6 mm; stigmas flat, abaxially non-papillate with rounded tip, or 2 plump lobes, 0.14–0.2–0.3 mm. Capsules 3–5 mm. 2n = 38.


Phenology: Flowering Mar–May.
Habitat: Banks of streams, meadows, hillsides, gullies, sandy-clay, sandy or rocky substrates
Elevation: 600-3100 m

Distribution

V7 128-distribution-map.gif

Ariz., Calif., Colo., Idaho, Mont., Nev., Oreg., Utah, Wyo.

Discussion

The possible occurrence of Salix lutea in Ginkgo Petrified Forest Park, Washington, needs to be investigated.

Hybrids:

Salix lutea forms natural hybrids with S. arizonica.

Selected References

None.

Lower Taxa

None.

"-0.3mm" is not declared as a valid unit of measurement for this property.

... more about "Salix lutea"
21 +, 4 +, 1 +, 16 +  and 29 +
long-silky +, pilose +, glabrous +  and glaucous +
ovate +, square +, oblong +  and flask--shaped +
0.03 cm0.3 mm <br />3.0e-4 m <br /> (0.09 cm0.9 mm <br />9.0e-4 m <br />) +
purple turning yellow +  and yellow +
0.04 cm0.4 mm <br />4.0e-4 m <br /> (0.08 cm0.8 mm <br />8.0e-4 m <br />) +
hairy +  and glabrous +
Rounded (?) +, Acute (?) +  and Acuminate (?) +
George W. Argus +
Nuttall +
subcordate +, convex +  and rounded +
Salix sect. Vetrix +
tapering +
yellowish green +  and reddish +
ferruginous +  and white +
crenulate +  and serrulate +
glabrous or +  and sparsely moderately densely long-silky +
toothed +  and 2-fid +
persistent +
gray-brown +, yellowbrown +  and yellow-gray +
pistillate +  and loosely densely flowered +
pilose +  and glabrous +
subglobose +
0.05 cm0.5 mm <br />5.0e-4 m <br /> (0.7 cm7 mm <br />0.007 m <br />) +
intermediate +
0.3 cm3 mm <br />0.003 m <br /> (0.5 cm5 mm <br />0.005 m <br />) +
pendulous +, spreading +  and erect +
Yellow willow +
Ariz. +, Calif. +, Colo. +, Idaho +, Mont. +, Nev. +, Oreg. +, Utah +  and Wyo. +
600-3100 m +
connate +  and distinct +
bicolor +, tawny +  and brown +
0.06 cm0.6 mm <br />6.0e-4 m <br /> (0.12 cm1.2 mm <br />0.0012 m <br />) +
pistillate +  and staminate +
bisexual +  and unisexual +
Banks of streams, meadows, hillsides, gullies, sandy-clay, sandy or rocky substrates +
straight +
long-silky +, pilose +  and glabrous +
glossy +  and dull +
unbranched +  and spicate +
subterminal +  and axillary +
membranaceous +
hemiamphistomatous +, amphistomatous +  and hypostomatous +
oblong +  and narrowly broadly elliptic oblanceolate obovate or broadly obovate +
arranged +  and alternate +
marcescent +
deciduous +
2.8-3.9-5.6 +
42mm;90mm +
oblanceolate +, lanceolate +, elliptic +  and lorate +
0.8 cm8 mm <br />0.008 m <br /> (3.2 cm32 mm <br />0.032 m <br />) +
sinuate +, crenulate +  and serrulate +
2-7[-10]-carpellate +
ovoid +  and pyriform +
glandular-dotted +
pubescent +  and glabrescent +
convex;flat +
0.4 cm4 mm <br />0.004 m <br /> (1.9 cm19 mm <br />0.019 m <br />) +
Flowering Mar–May. +
N. Amer. Sylv. +
overlapping +
distinct +
Illustrated +  and Endemic +
decumbent;erect +
non-papillate +
cylindrical +
0.09 cm0.9 mm <br />9.0e-4 m <br /> (0.38 cm3.8 mm <br />0.0038 m <br />) +
caducous +  and persistent +
distinct +  and connate +
0.01 cm0.1 mm <br />1.0e-4 m <br /> (0.06 cm0.6 mm <br />6.0e-4 m <br />) +
persistent +  and deciduous +
Salix cordata var. watsonii +, Salix eriocephala var. watsonii +, Salix lutea var. watsonii +  and Salix rigida var. watsonii +
Salix lutea +
Salix sect. Cordatae +
species +
rounded +
sympodial +, branching +  and heterophyllous +